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    <p>Here is the completed shader with all channels and RGB conversion (no filtering is performed however):</p> <pre><code>#version 130 #extension GL_EXT_gpu_shader4 : enable in vec2 texcoord; uniform mediump sampler2D tex; out mediump vec4 color; // YUV offset const vec3 yuvOffset = vec3(-0.0625, -0.5, -0.5); // RGB coefficients // BT.601 colorspace const vec3 Rcoeff = vec3(1.1643, 0.000, 1.5958); const vec3 Gcoeff = vec3(1.1643, -0.39173, -0.81290); const vec3 Bcoeff = vec3(1.1643, 2.017, 0.000); // U Y V A | Y U Y A | V Y U A | Y V Y A int GROUP_FOR_INDEX(int i) { return i / 4; } int SUBINDEX_FOR_INDEX(int i) { return i % 4; } int _y(int i) { return 2 * i + 1; } int _u(int i) { return 4 * (i/2); } int _v(int i) { return 4 * (i / 2) + 2; } int offset(int i) { return i + (i / 3); } vec3 ycbcr2rgb(vec3 yuvToConvert) { vec3 pix; yuvToConvert += yuvOffset; pix.r = dot(yuvToConvert, Rcoeff); pix.g = dot(yuvToConvert, Gcoeff); pix.b = dot(yuvToConvert, Bcoeff); return pix; } void main(void) { ivec2 size = textureSize2D(tex, 0).xy; // 480x486 ivec2 sizeOrig = ivec2(size.x * 1.5, size.y); // 720x486 // interpolate 0,0 -&gt; 1,1 texcoords to 0,0 -&gt; 720,486 ivec2 texcoordDenorm = ivec2(texcoord * sizeOrig); // 0 1 1 2 3 3 4 5 5 6 7 7 etc. int yOffset = offset(_y(texcoordDenorm.x)); int sourceColumnIndexY = GROUP_FOR_INDEX(yOffset); // 0 0 1 1 2 2 4 4 5 5 6 6 etc. int uOffset = offset(_u(texcoordDenorm.x)); int sourceColumnIndexU = GROUP_FOR_INDEX(uOffset); // 0 0 2 2 3 3 4 4 6 6 7 7 etc. int vOffset = offset(_v(texcoordDenorm.x)); int sourceColumnIndexV = GROUP_FOR_INDEX(vOffset); // 1 0 2 1 0 2 1 0 2 etc. int compY = SUBINDEX_FOR_INDEX(yOffset); // 0 0 1 1 2 2 0 0 1 1 2 2 etc. int compU = SUBINDEX_FOR_INDEX(uOffset); // 2 2 0 0 1 1 2 2 0 0 1 1 etc. int compV = SUBINDEX_FOR_INDEX(vOffset); vec4 y = texelFetch(tex, ivec2(sourceColumnIndexY, texcoordDenorm.y), 0); vec4 u = texelFetch(tex, ivec2(sourceColumnIndexU, texcoordDenorm.y), 0); vec4 v = texelFetch(tex, ivec2(sourceColumnIndexV, texcoordDenorm.y), 0); vec3 outColor = ycbcr2rgb(vec3(y[compY], u[compU], v[compV])); color = vec4(outColor, 1.0); } </code></pre> <p>If the image is going to be scaled up on the screen then you will likely want to do bilinear filtering, but this will need to be performed within the shader.</p>
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